Answers

From your description it appears you have purchased Windows Server CALs. This forum is dedicated to Remote Desktop Services, which requires RDS CALs. RDS CALs are
not included with the operating system and must be purchased separately.

If you purchase RDS CALs then you will need to Activate your RD Licensing server using RD Licensing Manager (licmgr.exe), and install your RDS CALs. After doing this you should set the Licensing mode and Specify the name of your RD Licensing server
in RD Session Host Configuration (tsconfig.msc).

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